Polymerizable composition and its uses

Abstract

The present invention provides a polymerizable composition, comprising, based on the total weight of the polymerizable composition: (a) 1-90 wt % of a monomer of a formula (I): wherein X 1 is H or methyl; X 2 is H or C 1 -C 2 alkyl; X is O or S; R 1 is C 1 -C 12 straight or branched alkylene or alkoxylene; and d and n are each independently an integer of 0 to 3; and (b) 0.1-10 wt % of a photo-initiator. The present invention also provides an optical film comprising a coating formed from the above polymerizable composition. The optical film can be used in backlight units for displays as a brightness enhancement film.

1 . A polymerizable composition comprising
 (a) 1-90 wt % of a monomer of a formula (I):   
       
         
           
           
               
               
           
         
       
       wherein
 X 1  is H or methyl; 
 X 2  is H or C 1 -C 2  alkyl; 
 X is O or S; 
 R 1  is C 1 -C 12  straight or branched alkylene or alkoxylene; and 
 d and n are each independently an integer of 0 to 3; and 
 (b) 0.1-10 wt % of a photo-initiator, 
 
       based on the total weight of the polymerizable composition. 
     
     
         2 . The composition according to  claim 1  wherein (a) is a monomer of formula (I 1 ): 
       
         
           
           
               
               
           
         
       
       wherein
 X 1  is H or methyl; 
 R 1  is methylene, ethylene, propylene or isopropylene; 
 n is an integer of 1 to 2. 
 
     
     
         3 . The composition according to  claim 1  wherein (a) is a monomer of formula (I 2 ): 
       
         
           
           
               
               
           
         
       
     
     
         4 . The composition according to  claim 1  wherein the monomer of formula (I) is in an amount of from 8 wt % to 70 wt %, based on the total weight of the polymerizable composition. 
     
     
         5 . The composition according to  claim 1  wherein the photo-initiator is in an amount of from 1 wt % to 5 wt %, based on the total weight of the polymerizable composition. 
     
     
         6 . The composition according to  claim 1  further comprising (c) other monomers. 
     
     
         7 . The composition according to  claim 6  wherein the refractive index of (c) other monomers is not less than 1.6. 
     
     
         8 . The composition according to  claim 6  wherein (c) is a monomer of formula (II): 
       
         
           
           
               
               
           
         
       
       wherein
 X 3  and X 4  are each independently H or methyl; 
 Y 1 , Y 2 , Y 3 , and Y 4  are each independently H, C 1 -C 2  alkyl, or OH; and
 a and b are each independently an integer of 0 to 3. 
 
 
     
     
         9 . The composition according to  claim 8  wherein (c) is a monomer of formula (II 1 ): 
       
         
           
           
               
               
           
         
       
     
     
         10 . The composition according to  claim 1  further comprising (d) a cross-linking agent. 
     
     
         11 . The composition according to  claim 10  wherein the cross-linking agent is a (meth)acrylate, urethane acrylate, polyester acrylate, epoxy acrylate or a combination thereof. 
     
     
         12 . A optical film comprising a substrate and at least one coating formed from the polymerizable composition according to  claim 1 . 
     
     
         13 . The optical film according to  claim 12  wherein the coating forms a light-gathering structure.